Add `MetricInputTransformer` #7517

Job	Run time
check-code / mypy	2m 4s
check-md-links / markdown-link-check	10s
check-package / init-store	4s
check-schema / schema	12s
check-package / pkg-build (ubuntu-latest)	31s
check-package / pkg-check (ubuntu-22.04, 3.8)	56s
check-package / pkg-check (ubuntu-22.04, 3.11)	58s
check-package / pkg-check (macos-12, 3.8)	1m 56s
check-package / pkg-check (macos-12, 3.11)	1m 38s
check-package / pkg-check (windows-2022, 3.8)	2m 55s
check-package / pkg-check (windows-2022, 3.11)	2m 52s
check-package / pkg-guardian	1s
	14m 17s

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